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Kinetic limitations of the Mg_2Si system for reversible hydrogen storage

机译：Mg_2Si体系可逆储氢的动力学局限性

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Despite the promising thermodynamics and storage capacities of many destabilized metal hydride hydrogen storage material systems, they are often kinetically limited from achieving practical and reversible behavior. Such is the case with the Mg_2Si system. We investigated the kinetic mechanisms responsible for limiting the reversibility of the MgH_2 + Si system using thin films as a controlled research platform. We observed that the reaction MgH_2 + 2-1Si q 2-1Mg_2Si + H_2 is limited by the mass transport of Mg and Si into separate phases. Hydrogen readily diffuses through the Mg_2Si material and nucleating MgH_2 phase growth does not result in reaction completion. By depositing and characterizing multilayer films of Mg_2Si and Mg with varying Mg_2Si layer thicknesses, we conclude that the hydrogenation reaction consumes no more than 1 nm of Mg_2Si, making this system impractical for reversible hydrogen storage.
机译：尽管许多不稳定的金属氢化物储氢材料系统具有令人鼓舞的热力学和储能能力，但它们通常在动力学上受到限制，无法实现实用和可逆的行为。 Mg_2Si系统就是这种情况。我们研究了使用薄膜作为受控研究平台来限制MgH_2 + Si系统可逆性的动力学机制。我们观察到，MgH_2 + 2-1Si q 2-1Mg_2Si + H_2的反应受到Mg和Si进入独立相的质量传输的限制。氢容易扩散通过Mg_2Si材料，成核的MgH_2相生长不会导致反应完成。通过沉积和表征具有不同Mg_2Si层厚度的Mg_2Si和Mg多层膜，我们得出结论，氢化反应消耗的Mg_2Si不超过1 nm，这对于可逆的氢存储来说是不切实际的。

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